I have had my sprinter for 10 years and 750k miles and I don't idle before or after the trip. I start it up, then proceed driving it lightly until it is fully warm. Now when I am about to park, I just take it easy for the last couple of miles. Plenty time for the turbo to cool down. Then I just park and shut down. Easy as pie.Do any of you idle your rigs before shutting down your diesel? Also how long will you let your van idle in neutral? For warming up in cold weather or just sitting in the van when cold outside.